wojtha

# Based on https://ilikestuffblog.com/2008/06/18/find-tests-more-easily-in-your-testlog/
class ActiveSupport::TestCase

  setup :log_example
 
  private
 
  def log_example
    Rails.logger.info "\nStarting #{@method_name}\n#{'-' * (9 + @method_name.length)}\n"
  end

wojtha

This is an example of how I combine interaction/service classes with Wisper event broadcasting in Rails.

In this example, I show a UsersController#create API, a corresponding service object, and all the test code/listeners to make it all happen.

The outcome is:

• Concepts in your system ("Signing up a user", "Creating an order") have a single entry point in your codebase, vs. making raw ActiveRecord calls to object.save in dozens of places.
• Since your concept has one entry point (the service class), you can easily grep for usage of it.
• Stupid easy to attach listeners to the service class
• All event listeners are very small and easily unit tested

wojtha

# A simple way to create private constants without all the noise of ruby's 'private_constant'
# 
# Before:
# class Foo
#   FOO = "bar"
#   private_constant :FOO
# end
#
# After:
# class Foo

wojtha

Ruby and Rails Interview Questions

Ruby

• What is a class?
• What is an object?
• What is a module? Can you tell me the difference between classes and modules?
• Can you tell me the three levels of method access control for classes and modules? What do they imply about the method?
• There are three ways to invoke a method in ruby. Can you give me at least two?
• Explain this ruby idiom: a ||= b

wojtha

Answers to [Ruby Interview Questions][1]

What is a class?

A text-book answer: classes are a blue-print for constructing computer models for real or virtual objects... boring.

In reality: classes hold data, have methods that interact with that data, and are used to instantiate objects.

Like this.

wojtha

class MailerJob
  include Sidekiq::Worker

  sidekiq_options queue: 'mailer'

  def perform(mailer_class, action, *params)
    mailer_class.constantize.send(action, *params).deliver!
  end

  # Module DeliverAsync provides extension for mailers to easily send emails in background.

wojtha

# Fixes complains such as:
# .rubocop.yml: Style/IndentationConsistency has the wrong namespace - should be Layout
# .rubocop.yml: Style/IndentationWidth has the wrong namespace - should be Layout
# .rubocop.yml: Style/DotPosition has the wrong namespace - should be Layout

layouts = %w[
  AccessModifierIndentation
  AlignArray
  AlignHash
  AlignParameters

wojtha

Vagrant.configure("2") do |config|
  # Base VM OS configuration.
  config.vm.box = "geerlingguy/ubuntu1404"
  config.vm.synced_folder '.', '/vagrant', disabled: true
  config.ssh.insert_key = false

  config.vm.provider :virtualbox do |v|
    v.memory = 256
    v.cpus = 1
    v.linked_clone = true

wojtha

wojtha

# Class Question::MultipleChoice is a simple, closed-ended question type that lets respondents select one or multiple
# answers from a defined list of choices.
#
# @example Definition
#    question = Question::MultipleChoice.new("Reference doesn't seem to be regular release. MAKE A BUILD?")
#      .choice(:build,   'b', '[b]uild')
#      .choice(:install, 'i', '[i]nstall and build')
#      .choice(:clean,   'c', '[c]lean install and build')
#      .choice(:skip,    's', '[s]kip')
#      .choice(:quit,    'q', '[q]uit')